If you're reliant on any Cydia packages, it's best to stay on your current jailbroken state. Reason is that just about everything requires a complete overhaul to work on iOS 7. So even if a public jailbreaking tool is released for iOS 7, you would have even sketchier support/compatibility of tweaks than the Evasi0n period. It's better to be safe with your current jailbroken state, than to bank on iOS 7 being better.